|Publication number||US7278561 B2|
|Application number||US 11/063,646|
|Publication date||Oct 9, 2007|
|Filing date||Feb 22, 2005|
|Priority date||Feb 20, 2004|
|Also published as||EP1715981A2, EP1715982A1, EP1718431A2, US7137540, US7316341, US7458492, US7484649, US8556149, US8893944, US20050184120, US20050189392, US20050189393, US20070034660, US20080197166, US20090178819, US20140027488, WO2005081999A2, WO2005081999A3, WO2005082000A2, WO2005082000A3, WO2005082579A1|
|Publication number||063646, 11063646, US 7278561 B2, US 7278561B2, US-B2-7278561, US7278561 B2, US7278561B2|
|Inventors||John W. Schnell, Daniel Paxton Wall, Timothy E. Terrell, Daniel U. Goodwin, Barbara A. Rose|
|Original Assignee||Black & Decker Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (108), Non-Patent Citations (1), Referenced by (7), Classifications (14), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present application claims the benefit under 35 U.S.C. § 119(e) of U.S. Provisional Patent Application Ser. No. 60/546,685, entitled “Oil Free Head Valve for Pneumatic Nailers and Staplers,” filed Feb. 20, 2004 which is herein incorporated by reference in its entirety.
The present invention generally relates to the field of power tools, and particularly to a head valve assembly for pneumatic fasteners, such as pneumatic nailers and staplers.
Pneumatic power tools are commonly employed in a variety of work places in order to accomplish various tasks. Typical pneumatic power tools include pneumatic fasteners, such as pneumatic nailers and pneumatic staplers. A typical system within a pnemutic fastener generates the desired hammering force by employing compressed air (typically supplied by a separate air compressor), a valve assembly including a valve plunger, and a piston assembly including a sliding piston that drives a long blade. In such system, the piston is forced downward when the air pressure above the piston head is greater than below it. Moreover, the piston is forced into an “up” position when the air pressure below the piston is greater than above it. In addition, a trigger assembly is employed to allow a user to control the actuation of the pneumatic fastener.
In use, the pneumatic fastener is actuated by a user activating the trigger assembly. Upon actuation, the trigger assembly closes the trigger valve while opening a passageway to the atmosphere as such compressed air is prevented from flowing above the valve plunger whereby pressure beneath the plunger is greater than pressure above the plunger. This configuration causes the valve plunger to rise up and compressed air to travel to the piston head. The piston and the blade are then driven downward by the compressed air causing a fastener (e.g. a nail or staple) to be propelled from the chamber. The downward sliding of the piston, in turn, channels the air inside the cylinder through a series of holes into a return air chamber. When a user then releases the trigger assembly, the plunger is pushed back into place by the compressed air and air flow to the piston head is blocked. In the absence of downward pressure, the piston head is also pushed back up by the compressed air in the return air chamber. As a result, the air above the piston head is forced out of the gun and into the atmosphere.
Although the standard pneumatic fastener, such as a nailer, works well for driving even thick nails through hard material such fasteners are disadvantageous in many respects. First, the standard pneumatic fastener typically employs functional features for controlling and directing air flow which involve expensive and time consuming manufacturing processes and result in decreased performance characteristics. For example, many pneumatic fasteners require a cross hole to be drilled and plugged through an outer cap or an angled hole to be drilled through such cap in order to get supply air from the air source, through the outer cap and to the back side of the valve piston chamber. One disadvantage associated with this design is possible significant increases in manufacturing costs, which in turn may be passed onto the consumer. An additional disadvantage associated with such configuration is that employment of machined holes provide rough surfaces (e.g. edges) over which the air must travel. The rough surfaces may increase air flow turbulence/friction thereby reducing the efficiency of air flow travel and possibly decreasing the efficiency of the pneumatic fastener. Current solutions to overcome increased friction typically involve the application of a lubricant to the rough surfaces. Utilization of such lubricants may increase the cost of operating pneumatic fasteners while also possibly simultaneously resulting in decreased productivity as the pneumatic fasteners must halt operation in order to have the lubricant provided. In addition, the aforementioned disadvantage is continuous for the lubricant has a limited useful lifespan and must be continuously replaced to assist in smoothing the surfaces over which the air must travel.
Therefore, it would be desirable to provide a pneumatic fastener which requires neither the machining of the outer cap to establish air flow patterns nor application of a lubricant to prevent increases in air flow friction.
Accordingly, in a first aspect of the present invention a head valve assembly for a pneumatic fastener including a piston assembly reciprocated within a cylinder assembly for driving a fastener and a housing having an end cap for at least partially enclosing the head valve assembly is provided. In an exemplary embodiment, the head valve assembly includes a valve piston for causing supply pressure to be ported to the piston assembly for moving the piston assembly within the cylinder assembly from a non-actuated position to an actuated position for driving the fastener. Further, an inner cap is disposed within the end cap around the valve piston. The inner cap includes an inlet port for porting pressure to the valve piston. In addition, a main seal is coupled to the valve piston for sealing the cylinder assembly from supply pressure while pressure is ported to the valve piston by the inner cap for holding the piston assembly in the non-actuated position. The main seal seals pressure ported to the valve piston by the inner cap from supply pressure ported to the piston assembly.
In specific embodiments of the instant head valve assembly, the inner cap may further include an exhaust port for porting exhaust from the head valve assembly. Further, the inner cap may be formed of a lubricious plastic. In additional embodiments, the main seal includes a lip seal for forming a seal with the inner cap and may provide shock absorption to the piston assembly. In further embodiments, the main seal may be coupled to the valve piston by a snap-lock mechanism. In such embodiment, the main seal may include a plurality of legs while the valve piston may include a plurality of leg receivers for coupling the main seal to the valve piston. For example, the snap-lock assembly comprises a plurality of legs extending from the main seal and a plurality of leg receivers disposed in an inner surface of the valve piston, each of the plurality of legs being received in a corresponding one of the plurality of leg receivers for coupling the main seal to the valve piston. In such embodiment, the piston assembly may include a projection, the plurality of legs for receiving and retaining the projection upon return of the piston assembly from the actuated position to the non-actuated position. In further exemplary embodiments, a lip seal is disposed between the valve piston and the inner cap.
In additional specific embodiments of the head valve assembly, a compression spring may be employed for biasing the valve piston toward the piston assembly and causing the main seal to seal the cylinder assembly from supply pressure. For instance, the compression spring may trap the plurality of legs for preventing the main seal from separating from the piston valve by the piston assembly as the piston assembly moves from the non-actuated position to the actuated position. It is contemplated that the present head valve assembly may be coupled to various types of pneumatic fasteners including a pneumatic nailer and a pneumatic stapler.
In an additional exemplary aspect of the present invention, a fastener device including dual actuation mode capability is disclosed. The apparatus of the present invention permits a user to select between a contact actuation mode in-which a user pulls or draws a trigger and actuation of the fastener device is initiated by a contact safety assembly and a sequential actuation mode in-which the contact safety assembly is depressed first and the trigger initiates actuation of the fastening event. The fastener device includes a sliding contact safety assembly which is configured to reciprocate towards/away from a driver housing. The contact safety assembly includes a contact member for contacting a workpiece. A rotating rod is pivotally operable with respect to an intermediate linkage. A pivot pin may be attached to the intermediate linkage. The rotating rod may include a recess for receiving the pivot pin. The pivot pin is configured with a first shoulder or ledge and a second shoulder which is off-set from the first shoulder. The second shoulder is further away from an end of the rod, opposite the linkage, than the second shoulder. The rod may be rotated to orientate either the first or the second shoulders toward a trigger assembly. The trigger assembly is pivotally coupled, via a pivot pin, to the driver housing. Trigger assembly is constructed so that a portion of the trigger contacts with the selected shoulder on the rotating rod so that the rod acts a stop for the trigger. A trigger lever is preferably included for actuating a valve or the like for permitting compressed air (in the case of a pneumatic fastener) to enter a driver chamber for forcing a piston with a driver blade attached thereto to secure a fastener. A toggle switch may be included to engaged with the rod to allow for efficient rotation. Preferably, a toggle switch is configured to remain in a fixed position while the contact safety assembly slides.
In a further aspect, a depth adjustment system is included to permit varying the depth to which a fastener to be secured will be driven. In this aspect of the invention, a threaded thumb wheel is included to engage with a threaded portion of a pivot pin included on the intermediate linkage. A washer, biased into engagement with the thumb wheel, having a series of detents is included to secure the thumb wheel in the desired position along the pivot pin. The thumb wheel may be manipulated to increase or decrease the overall length of the contact safety system thereby varying the extent to which a fastener will be driven into a workpiece.
In a further exemplary aspect of the present invention, an adjustable handle exhaust assembly is provided. The adjustable handle exhaust assembly includes a base, which includes a base plate and a protrusion protruding from the base plate. The protrusion is centrally hollow and includes an inner surface and an outer surface. The base plate includes an inlet opening and an exhaust opening defined therethrough. The inlet opening is interconnected with a channel defined by the inner surface of the protrusion. A cap is coupled to and supported by the base and includes an exit opening. A quick connector coupler is positioned inside the channel defined by the inner surface of the protrusion. When coupled to a pneumatic fastener, the quick connector coupler is suitable for connecting to an air supply hose to input compressed air to the pneumatic fastener via the channel defined by the inner surface of the protrusion and the inlet opening, and exhaust from the pneumatic fastener may exit through the exhaust opening and the exit opening.
In a still further exemplary aspect of the present invention, a pneumatic fastener is provided. The pneumatic fastener includes a handle which includes an inlet channel and an outlet channel. An adjustable handle exhaust assembly is coupled to the handle for connecting to an air supply hose to input compressed air to the pneumatic fastener via the inlet channel and outputting exhaust of the pneumatic fastener via the outlet channel to outside. The adjustable handle exhaust assembly includes a base, a cap and a quick connector coupler. The base includes a base plate and a protrusion protruding from the base plate. The protrusion is centrally hollow and includes an inner surface and an outer surface. The base plate includes an inlet opening and an exhaust opening defined therethrough. The inlet opening is interconnected with a channel defined by the inner surface of the protrusion. The cap is coupled to and supported by the base and includes an exit opening. The quick connector coupler is positioned inside the channel defined by the inner surface of the protrusion. The quick connector coupler is suitable for connecting to the air supply hose to input the compressed air to the pneumatic fastener via the channel defined by the inner surface of the protrusion, the inlet opening, and the inlet channel, and the exhaust may exit through the outlet channel, the exhaust opening and the exit opening.
In another exemplary aspect of the present invention, a handle for a pneumatic fastener is provided. The handle includes an inlet channel for inputting compressed air into the pneumatic fastener, an outlet channel for outputting exhaust of the pneumatic fastener to outside, and an adjustable handle exhaust assembly coupled to the handle. The adjustable handle exhaust assembly includes a base, a cap, and a quick connector coupler. The base includes a base plate and a protrusion protruding from the base plate. The protrusion is centrally hollow and includes an inner surface and an outer surface. The base plate includes an inlet opening and an exhaust opening defined therethrough. The inlet opening is interconnected with a channel defined by the inner surface of the protrusion. The cap is coupled to and supported by the base and includes an exit opening. The quick connector coupler is positioned inside the channel defined by the inner surface of the protrusion. The quick connector coupler is suitable for connecting to an air supply hose to input the compressed air to the pneumatic fastener via the channel defined by the inner surface of the protrusion, the inlet opening, and the inlet channel, and the exhaust may exit through the outlet channel, the exhaust opening and the exit opening.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention and together with the general description, serve to explain the principles of the invention.
The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures in which:
Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
Referring now to
Referring now to
In an exemplary embodiment, the housing 104 includes a first end 107 and a second end 109. The first end of the housing 107 may couple with various mechanical devices to enable the functionality of the nailer, such as a nose casting assembly, which may enable the operation of the driver blade. The second end 109 of the housing 104 includes a first housing fastening point 110, a second housing fastening 111, a third housing fastening point 112, and a fourth housing fastening point 113. In an advantageous embodiment, the fastening points allow the coupling of an outer cap 114 with the second end 109 of the housing 104. It is understood that the outer cap 114 may be composed of various materials, such as aluminum, steel, plastic, and the like. The fastening points may enable the use of a variety of fasteners. Suitable fasteners may include a screw, bolt, clip, pin, and the like. In the current embodiment, the cap 114 includes a first cap fastening point 115, a second cap fastening point 116, a third cap fastening point 117, and a fourth cap fastening point 118. The cap fastening points align with the housing fastening points to enable the fasteners to engage with the housing 104 and the cap 114 thereby securely affixing their position relative to one another.
In the exemplary embodiment, the housing recessed area 125 is defined on one end by the first end 107 of the housing 104 and on the other end by the second end 109 of the housing 104. The cap 114 further defines an outer cap recessed area 119. When the cap 114 is coupled with the housing 104, a fully defined recessed area 129 (as illustrated in
As illustrated in
In further exemplary embodiments, as illustrated in
In the present exemplary embodiment, the head valve assembly at least partially occupies the recessed area 129. Further, a main seal 142 is adjustably coupled with an inner diameter 151 of the inner cap 150. The main seal 142 is further coupled with the piston 134 and a valve piston 144. In a preferred embodiment, the main seal 142 is seated upon the piston 134. This coupling allows the main seal 142 to provide shock-absorption to the piston 134 of the pneumatic fastener 100. The main seal 142, in a preferred embodiment, may be composed of a urethane material. Alternative materials, such as other plastics, metals, and the like, may be employed as contemplated by those of skill in the art which include the desired durability. Additionally, in such advantageous embodiment, the valve piston 144 is composed of a plastic material. It is further preferred that the plastic be an acetal which includes compounds that are characterized by the grouping C(OR)2, such as DelrinŽ, a registered trademark owned by the E.I. du Pont de Nemours and Company. Such composition provides the valve piston 144 with a reduced frictional coefficient while still enabling a secure coupling with the main seal 142.
As further illustrated in
As illustrated in
It is contemplated that the coupling of the main seal 142 with the valve piston 144 may be accomplished in a variety of ways. For example, in an exemplary embodiment, the main seal 142 is coupled with the valve piston 144 via a snap lock mechanism. In an advantageous embodiment, as illustrated in
As illustrated in
In operation, the three legs of the main seal 142 may be inserted within the three leg receivers of the valve piston 144. Upon being fully inserted, the tabs formed at the terminus of each leg may snap into place with respect to the leg receivers. The snapping into place may be accomplished in a variety of manners. In the present example, the material composition and configuration of the legs provide the force which snaps the tabs into place. The tabs assist in securing the position of the main seal 142 relative to the valve piston 144 by coupling the tabs against the valve piston 144. In alternative embodiments, the snap mechanism may be enabled as a spring loaded assembly and the like as contemplated by those of ordinary skill in the art. It is further contemplated that the main seal 142 and the valve piston 144 may be an integrated single unit.
In further exemplary embodiments, a secondary coupling of the valve piston 144 with the main seal 142 occurs via a tongue and groove assembly. The valve piston 144 includes a tongue member disposed about the circumference of a bottom edge of the valve piston 144. In a corresponding circumferential position on the main seal 142, a groove is established. Thus, when the main seal 142 is coupled with the valve piston 144, via insertion of the plurality of legs into the plurality of leg receivers, the tongue is inserted within the groove to provide secondary coupling support. It is contemplated that the secondary coupling characteristics may be provided through various alternative mechanisms. For example, the secondary coupling may be established by employing a friction lock mechanism, a compression lock mechanism, a latch mechanism, and the like, without departing from the scope and spirit of the present invention.
As illustrated in
The securing of the piston projection 136 by the three legs may be accomplished using various mechanisms. In a preferred embodiment, the three legs serve as a piston catch by providing a friction fit for engaging against the piston projection 136. Alternatively, the enabling of the piston catch may occur through the use of compression assemblies, ball joint assemblies, and the like. It is understood that the three legs trap and hold the piston projection 136 when the piston 134 is established in an “up” position (as illustrated in
In an exemplary embodiment, as illustrated in
The functionality of the compression spring 148 in combination with the snap fit of the main seal 142 with the valve piston 144 assists in enabling the main seal 142 to establish and maintain a seal between the supply pressure and the pressure behind the valve piston 144. In the current embodiment, the main seal 142 includes a main lip seal 143 to further assist in providing the above mentioned functionality. The main lip seal 143 further enables the main seal 142 to slidably couple with the inner diameter 151 of the inner cap 150. Thus, the main lip seal 143 enables the main seal 142 to travel within the inner cap 150 and maintain the seal between the supply pressure and the pressure behind the valve piston 144. It is understood, that the travel of the main seal 142 translates into a travel of the valve piston 144, within the inner cap 150, and the compression or extension of the compression spring 148. A secondary lip seal 146 is set upon the valve piston 144. The secondary lip seal 146 is set on the side opposite the coupling of the main seal 142 against the valve piston 144. The secondary lip seal 146 may assist in providing a seal between the valve piston 144 and the inner cap 150.
It is contemplated that the inner cap 150 may be composed of various materials. For example, the inner cap 150 may be composed of DelrinŽ, a registered trademark owned by the E.I. du Pont de Nemours and Company. A composition including DelrinŽ is advantageous for DelrinŽ is an acetal which is a lubricious plastic providing a surface which may reduce the amount of turbulence/friction involved with the travel of the compressed air into or out of the head valve assembly 140 of the present invention. Further, the use of DelrinŽ for the valve piston 144, as stated previously, may reduce the amount of turbulence/friction encountered by the valve piston 144 during travel of the valve piston 144 within the inner diameter 151 of the inner cap 150. The materials used for the inner cap 150 may further comprise alternative plastics, TeflonŽ (a registered trademark of DuPont), silicone, and the like. While the present invention is enabled with the inner cap 150, which directs the air flow into and out of the head valve assembly 140 without requiring lubricants to be added, it is contemplated that various lubricants may be used in conjunction with the present invention. Lubricants, such as TeflonŽ based lubricants, silicone based lubricants, and aluminum disulfide based lubricants may be employed without departing from the scope and spirit of the present invention.
In an alternative embodiment, the main seal 142 and valve piston 144 may be replaced by a diaphragm 198, as illustrated in
During use, compressed air travels through the inner cap 150 and into the head valve assembly 140 via an inner cap inlet conduit 182. The inner cap inlet conduit 182 establishes an air flow pattern through the inner cap 150 from the inlet channel 126 of the handle 102. The housing inlet port 121, established on the second end 109 of the housing 104, enables the compressed air being provided through the inlet channel 126, to flow into the inner cap inlet conduit 182. The compressed air supplied through the inner cap inlet conduit 182 enables the head valve assembly 140 to operate the pneumatic fastener 100, i.e., the firing of the piston 134 to drive the fastener into a surface or work piece.
With particular reference to
The contact safety assembly 1106 includes a contact pad 1114 or foot for contacting with a workpiece. Additionally, a no-mar tip may be releasably connected to the contact pad for preventing marring of the workpiece, if the contact pad is formed of metal or includes a serrated edge for engaging a workpiece (such as in a framing nailer). For example, the contact pad 1114 may be shaped so as to translate or slide along the nose 1110 of the driver housing 1108. In the present embodiment, the contact pad 1114 is generally shaped as a hollow cylindrical structure for sliding along the generally cylindrical nose. An intermediate linkage 1116 is coupled to the contact pad 1114 to generally position a cylindrical rod 1118 along the driver housing 1108. For example, the movement of the intermediate linkage may permit the cylindrical rod 1118 to be variously positioned with respect to the driver housing 1108 and thus, a trigger assembly which is 1104 pivotally mounted to the driver housing 1108 and/or a handle 1120 fixedly secured to the driver housing 1108. In the current embodiment, the intermediate linkage 1116 is secured via a fastener to the contact pad 1114. In further embodiments, the contact pad and linkage may be unitary. In the present example, the intermediate linkage is constructed in a general L-shape to position the rod 1118 adjacent the trigger (i.e., towards the handle 1120). Additionally, the intermediate linkage may be constructed so as to generally conform to the driver housing, to avoid other pneumatic fastener components, i.e, avoid fastener magazine components, for aesthetic purposes or the like. Moreover, in the present instance, the intermediate linkage 1116 includes a pivot pin 1122 coupled to an end of the linakge 1116. The pivot pin 1122 may be secured via a fastener, a friction fit or unitarily formed with the intermediate linkage. In the present embodiment, the pivot pin 1122 is received in an aperture defined in a tab which extends generally perpendicular to a leg of the generally L-shaped linkage. A portion of the pivot pin 1122 may be received in a corresponding cylindrical recess formed in the rod 1118 for at least partially supporting/pivotally connecting the rod 1118 to the intermediate linkage via the pivot pin 1122.
In further embodiments, a depth of drive mechanism may be disposed between the contact pad 1114 and an intermediate linkage 1116. Additionally, if a depth of drive or recess adjustment is not desired, the rod 1118 may extend into a recess or aperture included in a tab extending from an end of an intermediate linkage. In still further embodiments, a partially threaded pivot pin may be threaded into an aperture in the intermediate linkage and function as a pivot pin for the rod 1118. Alternatively, a rod may include an extension which may be received in an aperture in the intermediate linkage for achieving substantially the same functionality.
With particular reference to FIGS. 12 and 13A–C, the rod 1118 includes a first shoulder 1146 and a second shoulder 1148. The first and the second shoulders are formed at offset distances along the length of the rod 1118 such that the orientation of a trigger 1152 and thus, a trigger lever 1142 pivotally coupled via a trigger lever pivot pin 1140 to the trigger may be varied. For example, the orientation/lateral position of the trigger lever 1142 permits selecting contact actuation mode (as illustrated in
With continued reference to
In further examples, the toggle switch 1138 may include a detent for engaging with the contact safety cover in order to frictionally secure the toggle switch in a desired orientation (i.e. contact actuation or sequential fire). Moreover, the toggle switch may include a cam shaped outer surface for frictionally engaging the contact safety housing to retain the toggle in a desired orientation. For example, a detent and/or cam surface may be included to secure the toggle switch in sequential fire mode. Those of skill in the art will appreciate that the lever portion of the toggle may act as an indicator or indicia of the selected actuation mode to permit ready recognition. Additional symbols or markings may be included on the driver housing, the contact safety housing or provided as an adhered label to one of the housing to alert the user as to the mode selected. Preferably, the toggle switch is orientated at 90° (ninety degrees) or perpendicular to a main axis of the trigger so that the selected contact mode is readily observed. For example, the toggle lever may be orientated approximately 180° (one hundred eighty degrees) when disposed in contact actuation mode than when disposed in sequential actuation mode.
Referring now to
The adjustable handle exhaust assembly 1400 may be securely coupled to the second end 105 of the handle 102 of the pneumatic fastener 100 by the bolts 1420 to replace the handle adapter 156 and the handle exhaust 158. Preferably, the inlet opening of the base plate 1404 is interconnected with the inlet channel 126, and the exhaust opening 1418 is interconnected with the outlet channel 102. The quick connector coupler 1422 is connected to an air supply hose for supplying compressed air to the pneumatic fastener 100. The compressed air flows from the air supply hose into the inlet channel 126, via the quick connector coupler 1422, the channel defined by the threaded inner surface of the protrusion 1406, and the inlet opening of the base plate 1404. The exhaust in the outlet channel 128 flows into the cap 1414 via the exhaust opening 1418 and exits the cap 1414 via the exit opening 1424. An operator may rotate the cap 1414 easily to change the position of the exit opening 1424 so that the exhaust air exiting the exit opening 1424 is directed in a desired direction (e.g., away from the operator).
In a further exemplary embodiment directed to the present invention, a method of manufacturing a pneumatic fastener, such as the pneumatic fastener 100, is provided. In a first step a housing including a piston assembly is provided. The housing may be of various configurations to support the functional operation of the pneumatic fastener and address aesthetic and/or ergonometric considerations. The housing is further provided with a housing inlet port and a housing exhaust port. The next step involves positioning a handle, including a handle adapter for receiving compressed air and a handle exhaust for exhausting the compressed air, to be coupled with the housing. The handle including an inlet channel coupled with the handle adapter and an outlet channel coupled with the handle exhaust. The inlet channel is further coupled with the housing inlet port and the outlet channel is further coupled with the housing exhaust port. Next, a head valve assembly including an inner cap of the present invention, is established in operational connection with the piston assembly. The inner cap further includes an inner cap inlet conduit which couples with the housing inlet port and an inner cap exhaust conduit which couples with the housing exhaust port. An outer cap is then fastened to the housing, the outer cap at least partially encompassing the head valve assembly and coupling with the inner cap.
It is contemplated that the method manufacturing may further include the establishment of a groove into the outer cap. The groove being enabled to receive an O-ring gasket and for providing a seal between the outer cap and the inner cap. In an alternative embodiment, the method of manufacturing may include the establishment of a groove in the inner cap for receiving an O-ring gasket and establishing a seal between the outer cap and the inner cap.
It is understood that the specific order or hierarchy of steps in the methods disclosed are examples of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the method can be rearranged while remaining within the scope and spirit of the present invention.
It is believed that the present invention and many of its attendant advantages will be understood by the forgoing description. It is also believed that it will be apparent that various changes may be made in the form, construction and arrangement of the components thereof without departing from the scope and spirit of the invention or without sacrificing all of its material advantages. The form herein before described being merely an explanatory embodiment thereof. Further, it is to be understood that the claims included below are merely exemplary of the present invention and are not intended to limit the scope of coverage which has been enabled by the written description.
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|JPH0679644A||Title not available|
|JPH02152775A||Title not available|
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|JPH05131378A||Title not available|
|JPH05138548A||Title not available|
|JPH07236542A||Title not available|
|JPS63306518A||Title not available|
|1||Porter-Cable "Round Head Framinng Nailer, FR350A," Part No. 910442; (C) 2005 Porter-Cable Corporation.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
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|U.S. Classification||227/130, 227/156, 227/10|
|International Classification||B25C1/00, B25C5/13, B25C1/04, B25C1/14|
|Cooperative Classification||B25C1/042, B25C1/008, B25C1/047, B25C1/04|
|European Classification||B25C1/00D, B25C1/04D, B25C1/04B2|
|May 4, 2005||AS||Assignment|
Owner name: BACK & DECKER INC., DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHNELL, JOHN W.;WALL, DANIEL PAXTON;TERRELL, TIMOTHY E.;AND OTHERS;REEL/FRAME:016189/0677;SIGNING DATES FROM 20050329 TO 20050408
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